Method of manufacturing a semiconductor device having a stacked capacitor
View Patent ↗A stacked capacitor in a memory cell has a bottom electrode made of a metal or metal compound, a capacitor insulation film and a top electrode made of a metal or a metal compound. The capacitor insulation film includes an aluminum oxide film having a thickness of 2 to 4 nm and in contact with the bottom electrode, and an overlying hafnium oxide film having a thickness of 3 to 6 nm. The stacked capacitor has a higher resistance against a biased temperature test.
1. A method for manufacturing a stacked capacitor in a semiconductor device, consecutively comprising:
forming a bottom electrode including a metal or a metal compound overlying a substrate;
forming a capacitor insulation film on said bottom electrode, said capacitor insulation film including a first aluminum oxide film, a hafnium oxide film and a second aluminum oxide film in this order as viewed from said bottom electrode; and
forming a top electrode including a metal or a metal compound on said capacitor insulation film,
wherein said capacitor insulation film forming step consecutively includes depositing said first aluminum oxide film, depositing said hafnium oxide film in an amorphous state, depositing said second aluminum oxide film, and polycrystallizing said deposited hafnium oxide film.
2. The method according to claim 1 , wherein a sum of thicknesses of said first and second aluminum oxide films is 2 to 5 nm.
3. The method according to claim 1 , wherein said hafnium oxide film has a thickness of 3 to 6 nm.
4. The method according to claim 1 , said method further consecutively comprising:
forming a metal silicide layer overlying said semiconductor substrate; and
then forming said stacked capacitor directly on said metal silicide layer.
5. A method for manufacturing a stacked capacitor in a semiconductor device, consecutively comprising:
forming a bottom electrode including a metal or a metal compound overlying a substrate;
forming a capacitor insulation film on said bottom electrode, said capacitor insulation film including a first aluminum oxide film, a hafnium oxide film and a second aluminum oxide film in this order as viewed from said bottom electrode; and
forming a top electrode including a metal or a metal compound on said capacitor insulation film,
wherein said capacitor insulation film forming step consecutively includes depositing said first aluminum oxide film, depositing said hafnium oxide film in an amorphous state, polycrystallizing said deposited hafnium oxide film, and depositing said second aluminum oxide film.
6. A method for manufacturing a stacked capacitor in a semiconductor device, consecutively comprising:
forming a bottom electrode including a metal or a metal compound overlying a substrate;
forming a capacitor insulation film on said bottom electrode, said capacitor insulation film including a first aluminum oxide film, a hafnium oxide film and a second aluminum oxide film in this order as viewed from said bottom electrode; and
forming a top electrode including a metal or a metal compound on said capacitor insulation film,
wherein said capacitor insulation film forming step includes depositing said hafnium oxide film in an amorphous state, and said top electrode forming step includes polycrystallizing said deposited hafnium oxide film.